A5019953745- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Radio Frequency Integrated Circuit Design
- Electrocatalysts for Energy Conversion
- Fluid Dynamics and Turbulent Flows
- Fuel Cells and Related Materials
- Fluid Dynamics and Vibration Analysis
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Probability and Risk Models
- Advancements in Semiconductor Devices and Circuit Design
- Photonic and Optical Devices
- Advanced Power Amplifier Design
- Heat Transfer Mechanisms
- Semiconductor Quantum Structures and Devices
- Statistical Distribution Estimation and Applications
- Heat Transfer and Optimization
- 3D IC and TSV technologies
- Semiconductor Lasers and Optical Devices
- Lattice Boltzmann Simulation Studies
- GaN-based semiconductor devices and materials
- Electrostatic Discharge in Electronics
- Microwave Engineering and Waveguides
- Bayesian Methods and Mixture Models
- Optical Network Technologies
The University of Tokyo
2014-2024
The Institute of Statistical Mathematics
1994-2023
Tokyo University of Agriculture and Technology
2018-2022
Mitsubishi Electric (Japan)
1987-2014
Mitsubishi Group (Japan)
2002-2014
Mitsubishi Electric (Germany)
2006-2012
Furukawa Electric (Japan)
2003
Nagoya University
1991
In the present study, solid oxide cells (SOCs) were operated in electricity generation (solid fuel cell, SOFC) mode and hydrogen production electrolysis SOEC) mode. The electrodes fabricated with nickel-gadolinia doped ceria (Ni-GDC) nickel-yttria stabilized zirconia (Ni-YSZ) composites investigated. correlations between changes microstructure degradation of electrochemical performance are discussed. mechanisms correlated Ni phase found to be similar for Ni-GDC Ni-YSZ electrodes. On other...
We introduce a new class of distributions by generalizing the subexponential to investigate asymptotic relation between tails an infinitely divisible distribution and its Lévy measure. call one-sided μ O-subexponential if it has positive tail satisfying limsup x →∞ μ*μ(x,∞)/μ(x,∞)<∞ . Necessary sufficient conditions for be are given in similar way case work Embrechts et al. It is critical importance that not closed under convolution roots. This property leads difference our result...
A framework for the automatic segmentation of large 3-D datasets microscopic images is designed and tested microstructures solid oxide cells (SOC) electrodes reconstructed using focused ion beam—scanning electron microscopy (FIB-SEM). The developed algorithm utilizes a simple, yet very effective deep neural network based on patch-convolutional layers (patch-CNN) in encoder-decoder configuration. guidelines selection architecture preparing minimizing training dataset are given. proposed...
Abstract Microstructure of electrodes determines the performance electrochemical devices such as fuel cells and batteries. The efficiency economic feasibility these technologies depend on stability microstructures throughout their lifetime. Although modeling techniques were proposed for determining electrode from 2- or 3-dimensional microstructural data, it is still extremely challenging to predict long-term structural degradation by means numerical simulations. One major challenges overcome...
This paper describes the design and experimental results for a 3.2-V operation single-chip AlGaAs/GaAs heterojunction bipolar transistor (HBT) monolithic microwave integrated circuit (IMMIC) power amplifier GSM900 DCS1800 dual-band applications. The following two new techniques are proposed implementing amplifier. One is an on-chip HBT bias switch which in turn switches between 900 1800 MHz. configuration allows using high turn-on voltage of 1.3 V HBT's to operate with 3-V low supply...
Nickel-gadolinium doped ceria (Ni-GDC) composite anodes gain a lot of attention as they have potential to be beneficial solution for the intermediate temperature solid oxide fuel cells. In this paper, influence initial microstructure Ni-GDC anode on polarization characteristics and its deterioration in 100h operation are investigated. The microstructures investigated determined by different sizes aspect ratios GDC powders, but all having same compositions NiO:GDC = 60:40 vol.%. It was found...
We characterize the subexponential densities on $(0,\infty)$ for compound Poisson distributions $[0,\infty)$ with absolutely continuous Lévy measures. As a corollary, we show that class of all probability density functions $\mathbb R_+$ is closed under generalized convolution roots sums. Moreover, give an application to distribution supremum random walk.
In order to quantitatively investigate the correlation between solid oxide fuel cell anode microstructure evolution and resulting electrochemical performance, of three-phase boundary nickel specific surface area were calculated. A three dimensional numerical simulation overpotential is conducted using a Lattice Boltzmann Method (LBM), which solves species transport equations coupled with reaction at three-phases-boundary. Phase field method introduced simulate microstructural nickel-yttria...
Time evolutions of electrochemical performance La0.57Sr0.38Co0.2Fe0.8O3-δ (LSCF) during operation are evaluated based on three-dimensional microstructural analysis and simulation. After 100 hours at 700 800°C, increases in polarization ohmic resistances observed. Segregated Sr phase is found inside the LSCF layer after 800°C. LSCF, GDC, segregated Co phase, GDC interlayer, interdiffusion SZO YSZ electrolyte segmented reconstructed by focused ion beam – scanning electron microscopy (FIB-SEM)...
High power and high-efficiency multi-finger heterojunction bipolar transistors (HBT's) have been successfully realized at Ku-band by using an optimum emitter ballasting resistor a plated heat sink (PHS) structure. Output of 1 W with power-added efficiency (PAE) 72% 12 GHz has achieved from 10-finger HBT the total size 300 /spl mu/m/sup 2/. PAE output density 5.0 W/mm is best performance ever reported for solid-state devices powers more than Ku-band.< <ETX...
In the present study, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-Gd0.1Ce0.9O1.95 (GDC) composite cathodes with different volume fractions were fabricated by screen printing method, and their polarization characteristics microstructure parameters are evaluated. Cathode overpotentials measured at measurement condition of 700 °C 100 % O 2 . Microstructures reconstructed focused ion beam-scanning electron microscope (FIB-SEM). The relationship between is quantitatively investigated.
In this study, composite Nickel-yttria stabilized zirconia (Ni-YSZ) identically fabricated fuel electrodes were operated as solid oxide cell (SOFC) and electrolysis (SOEC) under the same gas environment, their corresponding performances microstructural evolutions quantitatively evaluated. Fuel electrode performance degraded during FC operation, whereas was enhanced EC operation. Impurity segregation clearly observed using scanning electron microscopy (SEM) observation with low acceleration...